Ever since we launched Zoho Support, our
web-based help desk software, we’ve been receiving many requests for customized domain name support. We’re happy to share that Zoho Support now has this feature, enabling you to offer support directly from your domain. Both your customers and support reps can now access Zoho Support from a URL like say,
http://support.yourcompany.com.
Please note that this feature is available only in Zoho Support paid plans.

Here are the step by step instructions for mapping your domain URL:

Create a CNAME entry in your website’s (domain’s) admin panel (let’s say, support) and point it to customer-support.zoho.com